RelativeVolatilityIndex

Commonly abbreviated as RVI.Is a volatility indicator.Was developed by Donald Dorsey.Is computed using the high and low prices.Returns one time series, which is ratios of 10-period standard deviations for highs and lows rescaled to be between 0 and 100. FinancialIndicator["RelativeVolatilityIndex",n] uses a period-n standard deviation.The first value in the time series occurs after n periods.